class Async::Container::Keyed

This helps implement persistent processes that start up child processes per directory or configuration file. If those directories and/or configuration files are removed, the child process can then be cleaned up automatically, because those key/value pairs will not be marked when reloading the container.
Tracks a key/value pair such that unmarked keys can be identified and cleaned up.

def clear!

Clear the instance. This is normally done before reloading a container. 
def clear!
	@marked = false
end

def initialize(key, value)

@parameter value [Object] The value.
@parameter key [Object] The key.

Initialize the keyed instance 
def initialize(key, value)
	@key = key
	@value = value
	@marked = true
end

def mark!

Mark the instance. This will indiciate that the value is still in use/active. 
def mark!
	@marked = true
end

def marked?

@returns [Boolean] True if the instance has been marked, during reloading the container. 
def marked?
	@marked
end

def stop?

@returns [Boolean] True if the instance was stopped.

Stop the instance if it was not marked. 
def stop?
	unless @marked
		@value.stop
		return true
	end
end